Brake-shoe.



C. W. ARMBRUST.

BRAKE SHOE.

APPLICATION FILED MAY 10. 1900.

Patented Apr. 27, 1909.

3 SHEETS-SHEET 1.

A u uuuL G. W. ARMBRUST.

BRAKE SHOE.

APPLICATION FILED MAY 10. 1908.

Patented Apr. 27, 1909.

3 SHEETSSHEET 2.

O. W. ARMBRUST.

BRAKE SHOE. APPLICATION FILED MAY 10. 1906.

Patented Apr. 27, 1909.

3 SHEETS-SHEET 3.

CHARLES W. ARMBRUST. OF CHICAGO, ILLINOIS.

BRAKE-SHOE.

Specification of Letters Patent.

Patented April 27, 1909.

Application filed Kay 10, 1906. Serial No. 316,170.

To all whom it may concern:

Be it known that 1, CHARLES W. ARM- nRUsT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Brake-Qhoes, of which the following is a specification.

This invention relates to brake shoes of the class in which the wearing member or shoe roper is separably connected to the back. or cad supporting the same; and the invention'pertains more especially to novel and improved means for positioning and securing head the shoe upon and to the head.

Among the leading novel features of the invention may be mentioned the provision of axguide lug engaging the forked ends of the and also adapted to cooperate with the fastening key in retaining the shoe upon the head, the characteristic feature of this guide lug residing in the fact that it also constitutes in effect a keeper or staple for engagement with the fastening key.

Another prominent feature of the invenform andlocation of keeper lugs on the back of the shoe also adapted to be en aged by the fastening key,

such keeper lugs avlng a comparatively extended inclined outer surface that is shaped to fit the contour of the inner side of the head adjacent to the ends of the latter.

Another feature of the invention resides in the provision of a novel form and construe tion of central keeper lugs on the back of the .35

shoe.

The invention also includes a novel form of fastening key that is adapted, although not exclusively adapted, for cooperation with the other novel features above enumerated.

The invention will be readily understood when considered in connection with the acconlipanying drawings, which illustrate severa wherein,-,-

Figure 1' is a side elevational view of a brake-head, partly broken away, and a brake-shoe fastened theretofifFig. 2 is a top plan view of the brake-shoe; ,Flgs. 3 and 4.

are, respectively, rear and edge views of one of the central egper lugs shown in Figs. 1

and 2; Figs. 5 and '6 are, respectively, rear and edge views of the inclined keeper lugs lying to either side of the central lugs; Figs. SiFa-nd Q are perspective views of shoes,

5,6 shown; jvanous arrangements and combinationso my novel guide and keeper lugs;

practical embodiments thereof, and.

Fig. 10 is a fragmentary view in perspective, showing a modification of Fig. 9 Figs. 11, 1 and 13 are perspective views, generally sinnlar to Figs. 7, 8 and 9, showing still further modifications of structure and arrangement of the guide and keeper lugs; and Fig. 14 is a perspective view of my novel fastening key.

Referring to the drawings, 20 designates the shoe-bod proper in al the several figures of the rawings, whichguay be of the usual cast metal constructi'onand regulation size and adapted on its face to fit the contour of the tread of a car wheel.

Referring first to Figs. 1 to 6, inclusive, 21 designates as an entirety each of a pair of central keeper lugs mounted on the back of the shoe-body, each of which lugs preferably comprises an apertured web 21 a apted for the passa e of the fastening key, and front and rear anges .21 and 21, of which there are, as herein shown, a pair on either side of the web. The keeper as herein shown is it malleable or steel metal insert, although it is to be understood that it may .be formed of a metal stamping or of heavy wire. It 1s also shown'associated with spacing lugs 22 on the back of the shoe-body, said spacing lugs being of the character patent, No. 817,541, granted April 10,1906. The flanges 21 are'buried in the spacin lugs 22 and in the body of the shoe, am the flanges 21 are likewise embedded at their lower ends in the body of the shoe.

On'either side of the central keeper lugs above described are located auxiliary keeper lugs designated as anentir-ety by 23,wh1ch lugs are also herein shown as comprising malleable or steel inserts open for the passage of the fastening key and comprising an inverted U-shaped member 23 having on one side a pair of flanges 23, and on the opposite side a air of anchor-lugs 23, each of "which latter as, on its outer side, a projecting rib or fin 23 that assists in anchoring the keeper to a spacing lug 24 on the end of the shoe-body, the function of the spacing lugs '24 being similar to that of the spacing lugs 22', and fully described in my Letters Patent aforesaid. The lower end of the keeper is cast and embedded in the body of the shoe, as shown. An important feature of this keeper resides in the formation of its outer disclosed in my prior end, which consists of an inwardly and upwardly. inclined portion 23 that is of considerable extent and is shaped to fit the contour of the inner side of that portion of the head directly overlying the keeper; this construction serving, in cooperation with the key,

consistently with an economy of space, to pin and secure the end portions of'the shoe to the head in case the shoe should break transversely anywhere between the two keepers. The spacing lugs 24 on the ends of the shoe afford substantial seats or steps for the ends of the head, as indicated at 25, and

' stitute guide-lugs serving to prevent lateral dis lacement between the head and the shoe.

.ig. 1 clearly shows the manner of engagement of the head with the shoe thus formed, wherein 26 designates as an entirety the head, 27 the usual central lugs stepped upon the central spacing lugs'22, and on their inner sides contactin the upright walls of the central keepers 21, and 28 designates the forked ends shown as stepped upon the spacing lugs 24 and abutting the shoulders 26 and guide-lugs 24 he inner surface of the head is also shown as lying in close contact with the'extendedinclined'outer face of the keeper lugs 23. 29 shows a fastening (key; which may be of the usual form, orof the special construction shown in Figs. 14 and 15 and hereinafter more particularly described, said key passing between the forked ends of the head and through the keeper-lugs21 and 23 ,Of the shoe and the central retaining lugs 27 of the head.

In Figs. 1 and 2 I have indicated a central transverse scoring 20 of the shoe-body ".which'm'ayor maynot be employed in ass0- ciation with the fastening features above described, which scoring forms no part of my present invention, the same constituting in part the subject-matter of my Letters Patent aforesaid.

Fig. 7 shows the shoe-body provided on its back with a single central apertured keeperlug 30, and on its ends with keeper-lugs 31, which latter lugs not only interlockingly engage the'fastening key, but are also adapted to lie between the forks of the head so as to serve the additional function of lateral guidelugs. The ends of the forks of the head are stepped on the back of'the shoe on either side of the lugs 31,. and on either side of said lugs are formed What I term abutment-lugs 32, the inner faces of which constitute 1n efieet shoulders abutting against the ends of the forks of the head to prevent relative longitudinal displacement.

Fig. 8 shows a similarstructure and relative arrangement of end lugs as Fig. 7, ap-

plied to a transversely scored shoe, said shoe elng. equipped centrally, with a pair of cen- -which the fastening key upon and in association with form of key 37-, which is formed the key can be com tral fastening lugs 33, said lugs being in effect thelug 30 of Fig. 7 centrally divided, the

urpose of said division being to )rovide a astening lug for each half of the sioe-body in case the latter should break centrally.

Fig. 9 shows a modification of Fig. 7 wherein, in addition to the guide and abutment lugs of Fig. 7,' I have shown the shoe as equipped with the keeper lugs 23 of Fig. 1, said keeper-lugs being disposed slightly inwardl y of the guide-lugs 31.

Fig. 10 shows a shoe similar to Fig. 9, excepting that the guide-lug 34, instead of hav; ing the keeper formation'of Figs. 7, 8 and 9, is simply provided with a .seat. 34 for the key, without 'interlockingly engaging the key. It will be observed that in Figs. 7 and. 8 the guidedugs 31 constitute the only keeper-lugs at the ends of the shoe, and in Fig. 10 the lug 23 constitutes the only keeper-lug for the shoe; while in Fig. 9 both I of said lugs cooperate as keepers.

Figs. 11 shows a construction wherein the guiding and abutment lugs of Figs. 7 and 8 are formed upon spacing lugs 24, to revent injury to the brake-head when the s me has worn away, as more fully describedin my former'Letters Patent above referred to.

Fig. 12 shows a combination of guide and keeper lugs 31 and 23 of Fig. 9 with and upon "asp'acing lug 24, for the same purpose.

In Fig. 13 I have shown a construction wherein a keeper-lug 23 and abutment lugs 32 are associated with and upon a spacing ing 24; the keeper-lug 23 in this instance being made sufficiently narrow to lie between the forks of the head, so as to serve the additional function of a guide-lug. .Of course, said keeper-lug might be thus employed alone and without the spacing lug 24.

It should be understood that by the term keeper-lug I mean a lug or projection having an opening or aperture through asses, and so formed as tohave an inter ocking'relation with said key to prevent displacement of the I shoe from the head drawn.

My invention, in what I regard as its most complete and efficient form, employs both unless the key is withthe keeper-lug 23 and the combination guide and keeper lug 31, also preferably mounted the spacing lug 24;- but it should be understood that the lugs 23 and 31 are capable of independent use to advantage, either with or without the spacing lug 24. i

In Fig. 14 I have shown my improved tudinally splitting the end of the key forming a pair of prongs 37 which, near their by longiouter ends, are bowed or swelled as shown at 37*. In practice, this swelledsplit end of ressed sufficiently to be driven through the ower lug, and by its exshoe should be broken.

veach constituting a combination guide and described Ihave shown the same as'applied v gaging the inner surface 'width than the lug and extending inwardly of the head and shoe.

ansion forms a lock toprevent the'lower end of the shoe from falling ofi in case the This style of key/ can be made from the standard key. To illustrate the application of the key above in Fi s. 7 and 11.

l. A brakeshoe provided on its back with a central keeper-lug, and with a single lug keeper lug on either side of said central. lug.

2. A brake-shoe provided on its back with a central keeper-lug, a keeper-lug on either side of said central keeper-lug, and combination guide and keeper lugs beyond said lastnamed keeper-lugs.

3. A brake-shoe provided on its back near each end thereof with a combination guide and keeper-lug and withabutment lugs on either side of said combination lugs.

4. A brake-shoe provided on its back with a central keeper-lug and on either sidethereof with combination guide and keeper lugs, imd on either side of the latter with abutment ugs. v 5. A brake-shoe provided on its back with keeper-lugs on either side of the center thereof, said lugs having inclined surfaces of i greater extent than the width of the lug enof the head.

6. A brake-shoe provided on its back 0 either side of the center thereof with keeper- .lugs, said keeper-lugs each having an inclined head engaging surface of greater 7. A brake-shoe having central and outer keeper-lugs all comprising se arate'metallic members cast in the body of the shoe.

8. The combination with a shoe-body, of a keeper-lug comprising a separate metallic member embedded in said shoe, said lug having a strengthening 'rib.or flange formed on an upstanding portion thereof and disposed longitudinally. of the shoe.

9. The combination with a shoe-body, keeper-lug member embedded in said shoe, said lug having strengthening ribs or flanges on both sides thereof disposed longitudinally of the shoe.

10. A shoe-body provided with spacinglugs on each end, and further provided with combination guide and keeper-lugs on said spacing lugs.

11. A shoe-body provided with spacinglugs on each end, and with combination guide and keeper lugs on said spacing-lugs, and with other keeper-lugs inside said combination guide and keeper lugs.

- 12. A fastening-key for brake-shoes provided on its pointedend with a pair of prongs adapted to spring laterally into locking engagement witha fastening device of the shoe, said prongs being swelled on their outer margins near the tips thereof.

CHARLES W. ARMBRUS'I.

of a

Witnesses FREDERICK GoonwrN, SAMUEL N. POND.

comprising a separate metallic 

